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BQ25619: BQ25619 battery

suraj nagulamalyala
Prodigy 130 points
Part Number: BQ25619
Other Parts Discussed in Thread: BQSTUDIO, BQ25618

1.Hi team,
am currently working on bq25619 battery,i have a small query regarding charging the internal battery through bat pins

1.What is the voltage i need to get at BAT pins,as my input supply voltage VBUS is 5v

2.Am able to charge the battery upto 3v,later the battery is not getting charged as default setting

in Battery Voltage Limit Register (Address = 04h) is 4.2v as per datasheet mentioned,so my battery has to charge till 4.2v,
but which is not happening

3.what are the registers need to be configured or boost settings need to be done to enable battery charged till 4.2v

4.what are the use of min system voltage in Charger Control 0 Register,is there any co-relation with VBAT Registers

  • 0
    TI__Genius 10385 points

    suraj,

    1.What is the voltage i need to get at BAT pins,as my input supply voltage VBUS is 5v

    5V VBUS is acceptable. What  are your IINDPM, VINDPM, and ICHG settings? PSEL?

    2.Am able to charge the battery upto 3v,later the battery is not getting charged as default setting

    Please share your register outputs or BQStudio screen.

    3.what are the registers need to be configured or boost settings need to be done to enable battery charged till 4.2v

    Reverse mode (aka Boost mode aka OTG Mode) settings have no impact on forward mode (aka charging) operation. 

    4.what are the use of min system voltage in Charger Control 0 Register,is there any co-relation with VBAT Registers

    The Minimum System Voltage setting is the minimum value your SYS pin will output when an adapter is present.

    When the battery is below this VSYSMIN the BATFET will operate as an LDO to maintain VSYSMIN at SYS, while providing current BAT at whatever voltage it may be.

    Obviously the BATFET will suffer higher conduction losses in this operating mode, so the lower the VSYSMIN setting the less time you will spend in LDO mode. However the SYSMIN value must be high enough to allow your downstream system to power in the event of a damaged, shorted, or absent battery.

    Best Regards,
    Ricardo
  • 0 in reply to Ricardo
    Prodigy 130 points

    thank you

    Ricardo

    1.Present am not using any BQSTUDIO screen,just am checking voltage at my BAT terminals.

    for your ques->

    a.register outputs

    Below are registers from  0x00 to 0x0C in buffer[0] to buffer[12],Plz check that registers am getting that values and which is the BAT reg to config for 4.2v charging the battery

    b.What  are your IINDPM, VINDPM, and ICHG settings? PSEL?

    my configuration are as IINDPM=2.4amp from adapter as input with VINDPM=4.5v ,ICHG current=640ma and PSEL=LOW as am using adapter as input

    c.Reverse mode (aka Boost mode aka OTG Mode) settings have no impact on forward mode (aka charging) operation

    i didnt get much clarity on how reverse mode works,can you elaborate more,so what configurations should i do to get battery charged for 4.2v

    thanks

    suraj.N

  • 0 in reply to suraj nagulamalyala
    TI__Genius 10385 points

    a.register outputs

    Below are registers from  0x00 to 0x0C in buffer[0] to buffer[12],Plz check that registers am getting that values and which is the BAT reg to config for 4.2v charging the battery

    I think I see the issue. REG09[2:0] is reporting an NTC fault of JEITA COLD. How is the TS pin configured in your circuit? Setting REG00[6] to 1 will disable this fault protection and allow you to continue charging.

    b.What  are your IINDPM, VINDPM, and ICHG settings? PSEL?

    my configuration are as IINDPM=2.4amp from adapter as input with VINDPM=4.5v ,ICHG current=640ma and PSEL=LOW as am using adapter as input

    Excellent. This is a good configuration.

    c.Reverse mode (aka Boost mode aka OTG Mode) settings have no impact on forward mode (aka charging) operation

    i didnt get much clarity on how reverse mode works,can you elaborate more,so what configurations should i do to get battery charged for 4.2v

    Boost mode is used to create a regulate output voltage on the PMID pin. This output voltage is supplied by the battery. The intended use case for this feature is to provide power to an accessory device connected to PMID. BQ25618 specifically targets, but is not limited to, TWS charging cases. In this application the charging case has a battery and it is charged in forward mode by a supply provided at VBUS. When power is removed from VBUS and a headphone is attached, BQ25618 can be configured to enter reverse mode and charge the headphone by providing 5V to PMID.

    As I mentioned, none of the boost mode settings are active during charging. This makes those settings irrelevant.